Wheel guard device

Abstract

To provide a wheel guard device that can be used on narrow gauge rails.SOLUTION: A wheel guard device is provided with a fixed member that is fixed to the sleepers, a movable member that is supported by a support shaft provided on the fixed member and can be rotated around the support shaft toward the center of the track, and a guard rail that is fixed to the movable member and is arranged parallel to the main rails at a position separated from the support shaft. The fixed member has a fixing hole for fixing to the sleeper and a support part that supports the support shaft at a height position that is a specified distance above the top surface of the sleeper and at a position offset in the gauge direction from the fixing hole; the movable member has a guard rail holding part that is supported by the support shaft on the support part and rotates around the support shaft toward the center of the rails, and a mounting member to fix the guard rail to the guard rail holding part; the guard rail, when fixed to the guard rail holding part, is positioned such that an engaging part is located at a specified distance above the upper surface of the railway and moreover at specified distance outside the rail.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a wheel guard device for preventing derailment, which is disposed along a main rail on a railway track. [Background technology]

[0002] Conventionally, wheel guard devices that prevent wheels from derailing have sometimes been installed along the main rail on which railway vehicles (hereinafter simply referred to as "vehicles") run. For example, one prior art of this type is a wheel guard device in which a fixed part fixed to a sleeper supports a movable part with a horizontal pivot shaft, and a guardrail is fixed to the movable part (see, for example, Patent Document 1). Below, we will explain using a sleeper as an example. In this wheel guard device, the guardrail is equipped with an outer locking part that prevents the wheels from derailing toward the inside of the main rail, and an inner locking part that prevents the derailed vehicle from departing toward the outside of the track. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2009-138405 Summary of the Invention [Problem to be solved by the invention]

[0004] However, the wheel guard device of the above-mentioned prior art is difficult to adopt for narrow-gauge tracks because the movable part to which the guardrail is fixed rotates significantly toward the center of the track. For example, if the wheel guard device is installed along the main rail of a narrow-gauge track, the pair of guardrails will abut against each other when turned toward the center of the track. In addition, it is difficult to ensure sufficient space for inspecting the main rail or for compacting the ballast around the sleepers.

[0005] Furthermore, conventional railway tracks may use sleepers of different shapes depending on the line, and there is a demand for a wheel guard device that can be used with sleepers of different shapes.

[0006] SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a wheel guard device that can be used on narrow gauge tracks. [Means for solving the problem]

[0007] In order to achieve the above object, the wheel guard device according to the present invention comprises a fixed member fixed to a slab track or a sleeper, a movable member supported by a support shaft having a horizontal axis provided on the fixed member and capable of rotating around the support shaft toward the track center, and a guard rail fixed to the movable member and arranged parallel to the main line rail at a position spaced apart from the support shaft, the fixed member having a fixing hole for fixing to the slab track or the sleeper, and a guard rail for fixing to the slab track or the sleeper at a position offset from the fixing hole in the gauge direction. and a support portion that supports the support shaft at a height position that is a predetermined distance above the upper surface of the main rail, and the movable member has a guardrail holding portion that is supported by the support shaft on the support portion and rotates around the support shaft toward the center of the track, and an attachment member that fixes the guardrail to the guardrail holding portion, and the guardrail is arranged so that, when fixed to the guardrail holding portion, a locking portion that prevents wheel derailment is located at a position a predetermined distance above the upper surface of the main rail and a predetermined distance away in the direction outside the track.

[0008] With this configuration, the guardrail can be placed along the main rail by fixing the fixed member to the slab track or sleepers, supporting the movable member on the fixed member, and fixing the guardrail to the movable member. Even if a large horizontal lateral force acts on the guardrail, causing the wheels to derail, the fixed member can support it via the movable member. Because the movable member is supported by a support part located at a height a predetermined distance above the top surface of the track or sleeper of the fixed member, a compact wheel guard device can be constructed, and a wheel guard device can be provided even for narrow-gauge tracks. In this specification and claims, "horizontal lateral force" is also simply referred to as "lateral force."

[0009] Furthermore, the support shaft may be arranged offset in the horizontal direction toward the main rail with respect to the fixing hole that fixes the fixed member to the slab track or the sleeper inside the track. With this configuration, the support shaft that supports the movable member is arranged offset in the gauge direction with respect to the fixing hole, making it easy to inspect the fixing means, such as bolts, that fix the fixed member from above with the guardrail in an appropriate position.

[0010] Furthermore, the support portion of the fixed member that supports the movable member may be positioned at the same height as the fixed position of the guardrail. With this configuration, horizontal lateral forces acting on the guardrail can be supported by the support portion of the fixed member via the support shaft that supports the movable member. Therefore, large horizontal lateral forces acting on the guardrail can be appropriately supported by the fixed member.

[0011] The fixing member may also include a lower fixing member whose underside contacts the slab track or the sleeper, and an upper fixing member disposed above the lower fixing member and whose underside contacts the upper surface of the lower fixing member, the support portion being integrally formed with the upper fixing member, and the lower fixing member having a lower surface that contacts the upper surface of the slab track or the sleeper when the upper surface of the lower fixing member is horizontal. This configuration makes it possible to accommodate sleepers with different upper surface shapes by simply replacing the lower fixing member with one having a lower surface that matches the sleeper. Therefore, by preparing a lower fixing member that matches the sleeper, the structure above the upper fixing member can be reused, making it easy to apply the system to routes where different sleepers are used.

[0012] Furthermore, the lower surface of the upper fixing member and the upper surface of the lower fixing member may have a positioning step where a convex portion and a concave portion engage with each other. With this configuration, the positioning step consisting of the concave portion and the convex portion engages with each other by overlapping the lower surface of the upper fixing member with the upper surface of the lower fixing member, thereby positioning the lower fixing member and the upper fixing member. Therefore, misalignment between the lower fixing member and the upper fixing member can be appropriately prevented. [Effects of the Invention]

[0013] According to the present invention, it is possible to provide a wheel guard device that can be used on narrow gauge tracks. [Brief explanation of the drawings]

[0014] [Figure 1] FIG. 1 is a front view showing a wheel guard device according to one embodiment of the present invention. [Figure 2] 2 is a front view showing only the left side of the wheel guard device shown in FIG. [Figure 3] 3 is a plan view of the wheel guard device shown in FIG. 2. FIG. [Figure 4] 4 is a perspective view of the wheel guard device shown in FIG. 2. FIG. [Figure 5] 5 is a perspective view of the lower fixing member shown in FIG. 2. FIG. [Figure 6] 6 is a perspective view of the mounting member shown in FIG. 2. FIG. [Figure 7] FIG. 7 is a front view showing an example of a sleeper having an upper surface shape different from that of the sleeper shown in FIG. 1 and its lower fixing member. [Figure 8] 8 is a perspective view of the lower fixing member shown in FIG. [Figure 9] 9 is a front view showing the relationship between the force and the lateral force acting on the guard rail of the wheel guard device shown in FIG. 2. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0015] An embodiment of the present invention will be described below with reference to the drawings. In the following embodiment, an example will be described in which a wheel guard device 1 is provided on a track 110 made of prestressed concrete sleepers 100 (hereinafter simply referred to as "sleepers"). Also, an example will be described in which the wheel guard device 1 is configured so that the guardrails 10 can be turned toward the inside of the track. Regarding the concept of direction in this specification and claims, in a cross section perpendicular to the track 110 shown in FIG. 1 , the inside between the main line rails 120 is referred to as "inner" and the outside of the main line rails 120 is referred to as "outer." The direction in which the main line rails 120 extend, perpendicular to the plane of FIG. 1 , will be referred to as the "track direction."

[0016] (Track equipped with wheel guard device according to one embodiment) 1 is a front view showing a wheel guard device 1 according to one embodiment. As shown in the figure, a main line rail 120 is fixed to sleepers 100 arranged at predetermined intervals in a direction perpendicular to a track 110. A pair of main line rails 120 is provided in the direction in which the track 110 extends. The main line rails 120 are fixed by fixing a pair of pressure fittings 121 to the sleepers 100 with bolts 122.

[0017] Further, inside these main rails 120, wheel guard devices 1 are provided which respectively arrange guard rails 10 so as to extend along the main rails 120. The wheel guard devices 1 are provided between the main rails 120 by guard fastening devices 20 provided at intervals between a plurality of sleepers 100.

[0018] The wheel guard device 1 of this embodiment includes a fixed member 21 that fixes the guard fastening device 20 to the sleeper 100, and a movable member 25 that is supported and attached to the fixed member 21 by a support shaft 26. As a result, the wheel guard device 1 of this embodiment has a conversion function that can switch between a position where the movable member 25, to which the guardrail 10 is fixed, is fixed to the fixed member 21, and a retracted position (the position shown by the two-dot chain line) where the movable member 25 is rotated together with the guardrail 10 toward the center of the track inside the track 110. By using this conversion function to retract the guardrail 10 to a position away from the main line rail 120, work such as densely compacting the ballast immediately below the main line rail 120 with a compacting machine such as a tie tamper or multiple tie tamper (not shown) and rail grinding work can be efficiently performed.

[0019] The guardrail 10 is fixed to the movable member 25 to form an arrangement body, and is arranged so that the locking portion 13 protruding toward the main rail 120 maintains a predetermined distance A between the locking portion 13 and the head side surface of the main rail 120. The guardrail 10 is also arranged so that the top surface of the flange portion 12 is higher by a height B than the top surface of the main rail 120. As a result, when the wheel W tries to derail, it comes into contact with the locking portion 13 of the guardrail 10, preventing derailment.

[0020] (Configuration of wheel guard device according to one embodiment) Fig. 2 is a front view showing only the left side of the wheel guard device 1 shown in Fig. 1. Fig. 3 is a plan view of the wheel guard device 1 shown in Fig. 2. Fig. 4 is a perspective view of the wheel guard device 1 shown in Fig. 2. Fig. 5 is a perspective view showing the lower fixing member 22 shown in Fig. 2. Fig. 6 is a perspective view of the mounting member 30 shown in Fig. 2.

[0021] As shown in Figures 2 and 3, in the guard fastening device 20 of the wheel guard device 1 of this embodiment, the fixed member 21 is fixed to the sleeper 100 with a foundation bolt 36. The movable member 25 is supported on a support shaft 26 (using a bolt in this embodiment) provided on the support part 24 of the fixed member 21. The fixed member 21 has a lower fixed member 22 having a lower surface that contacts the upper surface of the sleeper 100, and an upper fixed member 23 that is fixed to the upper part of the lower fixed member 22. The upper fixed member 23 and the lower fixed member 22 are overlapped so that the lower surface 22a of the lower fixed member 22 contacts the upper surface 22b of the lower fixed member 22, and the lower surface 23a of the upper fixed member 23 contacts the upper surface 22b of the lower fixed member 22, and these are fixed integrally to the sleeper 100 with the foundation bolt 36. The right side of the upper fixed member 23 shown in the figure is fixed with the foundation bolt 36 via an inclined washer 35. The lower fixing member 22 fixed to the sleeper 100 has an upper surface 22b in a horizontal position, and an upper fixing member 23 is fixed thereon.

[0022] <Lower fixing member> As shown in Fig. 5, the upper surface 22b of the lower fixing member 22 is provided with a concave portion 41 extending in the longitudinal direction (gauge direction) of the sleeper 100. The lower surface 23a of the upper fixing member 23 is provided with a convex portion 42 (Fig. 4) that engages with the concave portion 41 and extends in the longitudinal direction (gauge direction) of the sleeper 100. These concave portion 41 and convex portion 42 form a positioning step 40 between the lower fixing member 22 and the upper fixing member 23. In this embodiment, the concave portion 41 is provided on the upper surface 22b of the lower fixing member 22 and the convex portion 42 is provided on the lower surface 23a of the upper fixing member 23, but the concave portion and the convex portion may be arranged in reverse, and the configuration of the positioning step 40 is not limited to these configurations.

[0023] With this positioning step 40, the concave portion 41 and the convex portion 42 engage with each other by overlapping the lower surface 23a of the upper fixing member 23 with the upper surface 22b of the lower fixing member 22, making it easy to position the upper fixing member 23 relative to the lower fixing member 22. This makes it possible to prevent misalignment between the lower fixing member 22 and the upper fixing member 23.

[0024] In addition, the lower surface 22a of the lower fixing member 22 in this embodiment has a first lower surface 22a1 that contacts the central horizontal plane of the upper surface of the sleeper 100, a second lower surface 22a2 that contacts the inclined surface of the upper surface of the sleeper 100, and a third lower surface 22a3 that contacts the central horizontal plane of the upper surface of the sleeper 100. The lower fixing member 22 is provided with fixing holes 34 through which foundation bolts 36 that fix the sleeper to the sleeper 100 are inserted, and hole portions 39 that form spaces for rotating the heads of the connecting bolts 27.

[0025] <Moving parts> As shown in Figures 2 and 4, the movable member 25 is supported by a support shaft 26 on a support portion 24 provided on the upper fixed member 23. The support portion 24 has the support shaft 26 at a height position L that is a predetermined distance above the top surface of the sleeper 100. In this embodiment, the height position L is the same as the position where the guardrail 10 is fixed to the movable member 25 (near the position where the recessed strip 14 of the guardrail 10 and the protruding strip 33 of the movable member 25 are engaged). As a result, the horizontal lateral force F (Figure 9) acting on the movable member 25 from the guardrail 10 can be supported by the support portion 24 of the fixed member 21 via the support shaft 26 that supports the movable member 25.

[0026] Additionally, the support shaft 26 is positioned offset in the direction of the main rail 120 with respect to the fixing hole 34 that fixes the fixed member 21 to the sleeper 100 inside the track. This allows the foundation bolts 36 that fix the fixed member 21 to the sleeper 100 to be inspected from above, with the guardrail 10 fixed to the movable member 25 and in position.

[0027] The movable member 25 supported by the support shaft 26 is rotatable around the support shaft 26 toward the inside of the track 110 (FIG. 1). The movable member 25 is fixed to the fixed member 21 with a connecting bolt 27 and a nut 28. The head of the connecting bolt 27 is inserted from above the movable member 25 through an insertion hole 37 into a connecting hole 38 of the upper fixed member 23, and is rotated 90 degrees to lock the head into the upper fixed member 23, and in this state is fixed by the nut 28. By fixing the movable member 25 to the fixed member 21 with the connecting bolt 27, the movable member 25 and the fixed member 21 become an integrated structure.

[0028] The movable member 25 is provided with guardrail holding portions 29 that temporarily hold the guardrail 10 at the position where the guardrail 10 is attached, and protruding strips 33 that engage with the recessed strips 14 provided in the web portion 11 of the guardrail 10. A pair of guardrail holding portions 29 are provided in the direction in which the guardrail 10 extends. A space is provided between the guardrail holding portions 29 to insert the attachment member 30.

[0029] <Guardrail> As shown in FIG. 4, the guardrail 10 has a generally T-shaped cross section, with a web portion 11 that is clamped to the movable member 25 by mounting members 30, and a flange portion 12 that is provided at the upper end of the web portion 11 and extends horizontally. The guardrail 10 has a length that allows it to be fixed to multiple guard fastening devices 20 that are provided in the direction in which the track 110 extends. The outer end of the flange portion 12 of the guardrail 10 forms a locking portion 13. The locking portion 13 is the portion that comes into contact with the wheel W and prevents derailment. The guardrail 10 also has a recessed portion 14 that is provided in the longitudinal direction and engages with a protruding portion 33 provided on the movable member 25.

[0030] <Mounting parts> 3 and 6, the mounting member 30 is sized to be inserted between a pair of guardrail holding portions 29 provided on the movable member 25. The mounting member 30 is provided with a pair of reinforcing portions 30a on the left and right sides opposite the surface that contacts the guardrail 10. A bolt hole 30b is provided between the reinforcing portions 30a.

[0031] <Installation of guardrails> As shown in Figures 2 and 3, the guardrail 10 has a predetermined length in the direction in which the track 110 extends and is a heavy object. For this reason, when attaching it to the movable member 25, the web portion 11 is temporarily supported by inserting it into the space formed between the main body of the movable member 25 and the guardrail holding portion 29 of the multiple guard fastening devices 20 provided in the direction in which the track 110 extends. The guardrail 10 with the web portion 11 temporarily supported is fixed to the movable member 25 by fixing the mounting member 30 to the movable member 25 with fixing bolts 31 and nuts 32. As a result, the locking portion 13 provided on the flange portion 12 of the guardrail 10 is disposed at an appropriate position at a height B that is a predetermined distance above the top surface of the main rail 120 and at a predetermined interval A that is a predetermined distance away in the direction outside the track.

[0032] Furthermore, by being fixed to the movable member 25, the concave strips 14 engage with the convex strips 33, maintaining the guardrail 10 fixed to the movable member 25. Even if the fixing bolts 31 of some of the multiple guard fastening devices 20 become loose, the engagement between the convex strips 33 of the movable member 25 and the concave strips 14 of the guardrail 10 restricts the guardrail 10 from moving upward. In other words, even if the fixing bolts 31 become loose, the guardrail 10 is prevented from coming off the movable member 25. Therefore, the guardrail 10 can be stably maintained in a held state on the movable member 25.

[0033] <Support point> Furthermore, in the wheel guard device 1 of this embodiment, the support shaft 26 that rotatably supports the movable member 25 is provided at a height position L equivalent to the position that supports the web portion 11 of the guardrail 10. The movable member 25 is supported by the support portion 24 of the fixed member 21 with the support shaft 26. In this way, by locating the shaft that turns (turns) the movable member 25 at an upper position and making the movable member 25 smaller, the turning radius of the movable member 25 is reduced. Therefore, the wheel guard device 1 of this embodiment can be turned appropriately even on a narrow-gauge track 110.

[0034] (Modification of the lower fixing member) Fig. 7 is a front view showing an example of a sleeper 101 having an upper surface shape different from that of the sleeper 100 shown in Fig. 1 and its lower fixing member 50. Fig. 8 is a perspective view of the lower fixing member 50 shown in Fig. 7. Note that in Fig. 7, the configuration above the upper fixing member 23 can be the same as the configuration in the above-mentioned example, and therefore illustration and description thereof will be omitted.

[0035] As shown in Fig. 7, the shape of the pressure fitting 123 that secures the main line rail 120 in the sleeper 101 in this example is different from that in the above-mentioned examples, and the sleeper 101 is fixed to the sleeper 101 with a spring-loaded bolt 124. The lower fixing member 50 in this example has a lower surface 50a that has a first lower surface 50a1 that contacts the central horizontal plane of the upper surface of the sleeper 100, and a second lower surface 50a2 that contacts the inclined surface of the upper surface of the sleeper 100. The lower fixing member 50 in this example is an example in which a part of the lower surface 23a of the upper fixing member 23 contacts the central horizontal plane of the upper surface of the sleeper 101.

[0036] As shown in Figure 8, the lower fixing member 50 of this embodiment also has a concave portion 41 serving as the positioning step 40 on the top surface 50b, and by engaging the convex portion 42 of the upper fixing member 23, the lower fixing member 50 and the upper fixing member 23 can be positioned. The lower fixing member 50 also has a fixing hole 34 through which the foundation bolt 36 (Figure 2) is inserted, and a hole portion 39 which forms a space for rotating the head of the connecting bolt 27. The configuration of this lower fixing member 50 above the upper fixing member 23 is the same as that of the fixing member 21 of the above embodiment, so a description thereof will be omitted.

[0037] In this way, by configuring the fixing member 21 with the lower fixing member 50 and the upper fixing member 23 and fixing them together to form the fixing member 21, it is possible to configure a wheel guard device 1 in which only the lower fixing member 50 can be replaced depending on the sleeper 101 and the other components can be used in common. The lower fixing member 50 is not limited to this example, and it is only necessary to change the shape of the lower surface depending on the sleeper 101, and is not limited to this embodiment.

[0038] (Support of lateral force by wheel guard device) FIG. 9 is a front view showing the relationship between the force acting on the guardrail 10 of the wheel guard device 1 shown in FIG. 2 and the force acting on the guardrail 10 when a lateral force F is applied. As shown in the figure, when a railcar is about to derail on a track 110 equipped with the wheel guard device 1, the wheel W abuts against the locking portion 13 of the guardrail 10. As a result, a large lateral force F acts on the guardrail 10. This lateral force F acts on the movable member 25 to which the guardrail 10 is attached, and then on the fixed member 21 to which the movable member 25 is fixed. At this time, in this embodiment, the support shaft 26 supporting the movable member 25 is located at a height L equivalent to the fixed position where the guardrail 10 is fixed to the movable member 25. Therefore, the lateral force F is received by the support portion 24 of the upper fixed member 23 via the support shaft 26 as an opposing force H. The connecting bolt 27 fixing the movable member 25 to the fixed member 21 also receives a force V that prevents the movable member 25 from lifting up due to the lateral force F.

[0039] Therefore, the large horizontal lateral force F from the wheel W acting on the guardrail 10 can be supported by the support part 24 of the fixed member 21 via the support shaft 26 that supports the movable member 25, and can also be appropriately supported by the fixed member 21 via the connecting bolt 27.

[0040] (summary) As described above, with the wheel guard device 1, the fixed members 21 are fixed to the sleepers 100, 101, the movable members 25 are supported on the fixed members 21, and the guardrail 10 is fixed to the movable members 25, thereby making it possible to appropriately position the guardrail 10 along the main rail 120. Even if a large lateral force F that would cause the wheel W to derail acts on the guardrail 10, the fixed members 21 can support the guardrail 10 via the movable members 25. Moreover, since the movable members 25 are supported on the support parts 24 of the fixed members 21 at a height position L that is a predetermined distance above the top surfaces of the sleepers 100, 101, a compact wheel guard device 1 that can appropriately withstand the horizontal lateral force F can be configured.

[0041] Therefore, according to the wheel guard device 1, even if the track 110 is narrow gauge, it is possible to appropriately prevent the wheels W from derailing by arranging the guardrail 10 along the main rail 120.

[0042] In the above embodiment, the sleepers 100 and 101 are used as an example. However, in the case of a slab track, the same effect can be obtained by using a lower fixing member that corresponds to the top surface shape, and the wheel guard device 1 is not limited to the sleepers 100 and 101.

[0043] Furthermore, the configurations and combinations thereof in the above-described embodiments are merely examples, and additions, omissions, substitutions, and other modifications of the configurations are possible as appropriate within the scope of the gist of the present invention. The present invention is not limited to the embodiments, but is limited only by the scope of the claims. [Explanation of symbols]

[0044] 1 Wheel guard device 10 Guardrails 13 Locking part 14 Concave 20 Guard fastening device 21 Fixing member 22 Lower fixing member 23 Upper fixing member 24 Support part 25 Movable parts 26 Support shaft 27 Connecting bolt 29 Guardrail holder 30 Mounting material 33 Convex strip 34 fixing hole 36 Foundation bolt 40 step part 41 Concave part 42 Convex part 50 Lower fixing member 50a bottom side 50b top surface 100 sleepers 101 Sleepers 110 orbit 120 Main Line Rail

Claims

1. A fixing member fixed to the slab track or the sleeper; a movable member supported by a support shaft provided horizontally on the fixed member and capable of rotating about the support shaft toward a center of the track; a guard rail fixed to the movable member and disposed parallel to the main rail at a position spaced apart from the support shaft; The fixing member has a fixing hole for fixing to the slab track or the sleeper, and a support portion for supporting the support shaft at a position offset from the fixing hole in the gauge direction and at a height position spaced a predetermined distance above an upper surface of the slab track or the sleeper, the movable member has a guardrail holding portion supported by the support shaft on the support portion and rotatable around the support shaft toward the center of the track, and an attachment member that fixes the guardrail to the guardrail holding portion, The guardrail is fixed to the guardrail holding portion and is positioned so that a locking portion for preventing derailment of the wheels is located a predetermined distance above the upper surface of the main rail and a predetermined distance away from the upper surface of the main rail in a direction away from the track.

2. 2. The wheel guard device according to claim 1, wherein the support shaft is disposed offset in a horizontal direction toward the main rail with respect to a fixing hole that fixes the fixing member to a slab track or to the sleeper inside the track.

3. 3. The wheel guard device according to claim 1, wherein the fixed member has a support portion that supports the movable member and is positioned at the same height as a fixed position of the guard rail.

4. the fixing members include a lower fixing member having a lower surface in contact with the slab track or the sleeper, and an upper fixing member disposed above the lower fixing member and having a lower surface in contact with an upper surface of the lower fixing member, The support portion is integrally formed with the upper fixing member, The wheel guard device according to any one of claims 1 to 3, wherein the lower fixing member has a lower surface that contacts an upper surface of the slab track or the sleeper when the upper surface of the lower fixing member is in a horizontal state.

5. 5. The wheel guard device according to claim 4, wherein the lower surface of said upper fixing member and the upper surface of said lower fixing member have positioning steps in which a convex portion and a concave portion engage with each other.

Images